OpenAI rolls GPT-5.4 Thinking and GPT-5.4 Pro across ChatGPT, API, and Codex

What OpenAI announced on X

On March 5, 2026, OpenAI said that GPT-5.4 Thinking and GPT-5.4 Pro were rolling out in ChatGPT, and that GPT-5.4 was also available in the API and Codex. The post framed GPT-5.4 as the point where OpenAI’s recent gains in reasoning, coding, and agentic workflows are being combined into a single frontier model.

What the OpenAI launch page confirms

OpenAI’s product page adds more detail. It says GPT-5.4 is the company’s most capable and efficient frontier model for professional work, while GPT-5.4 Pro is intended for users who want maximum performance on especially complex tasks. The same page says GPT-5.4 is OpenAI’s first general-purpose release with native computer-use capabilities, which means agents can operate across software interfaces and websites instead of only generating text.

• OpenAI says GPT-5.4 is now available in ChatGPT, the API, and Codex, with GPT-5.4 Pro available in ChatGPT and the API.
• The release notes say GPT-5.4 supports up to 1M tokens of context in Codex and the API for long-horizon tasks.
• OpenAI also highlights improved tool search, stronger work across spreadsheets, presentations, and documents, and better efficiency per token than GPT-5.2.
• On the published benchmark table, GPT-5.4 reaches 83.0% on GDPval, 57.7% on SWE-Bench Pro, 54.6% on Toolathlon, and 82.7% on BrowseComp.

Why this matters

The announcement matters because OpenAI is no longer presenting reasoning, coding, and computer use as separate tracks. GPT-5.4 is being marketed as a single model that can plan, browse tools, operate software, and produce higher-quality professional outputs in the same workflow. That is particularly important for Codex and API users who are building agents rather than standalone chat experiences.

It also suggests OpenAI is pushing performance and efficiency together. The launch page repeatedly emphasizes professional work, faster completion, and lower token use relative to GPT-5.2, which points to a strategy focused on practical deployment rather than just benchmark leadership. If the rollout performs as advertised, GPT-5.4 could become the default model layer for teams that want one OpenAI model to cover knowledge work, coding, and agent execution.

Sources: OpenAI X post · OpenAI GPT-5.4 launch page